解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
What elements on the periodic table are gases?Gases:A gas is one of the states of matter; the others are solids, liquids, and plasma. Gases expand or compress to fill any volume. Many are odorless although hydrogen sulfide smells like rotten eggs....
Periodic Table Group: An important part of chemistry is being able to understand the various useful features of the periodic table of the chemical elements. These features include the atomic number, row position and column position of each element. Each row is a period and each column is a gr...
Planets do not have the autonomy of atmospheres. Titan, one of Jupiter's moons, has an atmosphere. The atmosphere normally consists of Hydrogen, Helium, Oxygen (but not enough to breathe) and Nitrogen. Nitrogen is more common in the atmosphere than oxygen on Earth, but oxygen keeps us ...
解析 C 关系代词what在这里引导一个名词性从句作to be的表语,同时what在表语从句中又为is的表语成分,这类语法结构还有,如:Show what you have written.(把你所写的给我们看看)和She is not what she was a few years ago.(她可不是几年前的她了)。其他选项均不能表示这种语法关系。
结合is用形容词high。故答案为high。(7)考查形容词。根据At the top there isn't much oxygen(氧气)to take in,which is a problem for climbers.(在山顶没有太多氧气可供吸收,这对登山者来说是个问题。)little修饰oxygen表示几乎没有。故答案为Little。(8)考查代词。根据Each expert used...
doi:10.1097/00003246-199501001-00305Paradis, Norman A.Davison, Christopher M.Fuller, Jennifer A.Critical Care Medicine
百度试题 题目What is the atomic number of oxygen?A、2B、6C、8D、20Answer:C 科目四考试网___科目四考试题库相关知识点: 试题来源: 解析 http://www.km4ks.com/st/tk/ 反馈 收藏
水将继续保持其当今仅次于氧气的重要性。water 主语 will continue to be 谓语 what it is today 表语 next in importance to oxygen。补语
Themodern periodic tableis very similar to Mendeleev's table, but elements today are ordered by increasingatomic number, which reflects the number ofprotonsin an atom. There aren't any "undiscovered" elements, althoughnew elementscan be created that have even higher numbers of protons. What Are ...